Many of the National Park Service streams are often tended by people—experts in their fields—who get excited about nature and history and have a passion for protecting the places held in the public trust. For example, the African Burial Ground (a delightfully active one for such a small site) might share a resource for researching your slave ancestors in Virginia or link to a database that details the machinations of the slave trade. Other feeds may be manned by rangers who can answer history questions for you.
Andersonville wasn’t done to Americans by the Viet Cong or the Japanese. Americans did this to other Americans. This is our burden entirely. If we forget it, we forget it’s possible.